Enhanced electrochemical performance of CuCo2S4/carbon nanotubes composite as electrode material for supercapacitors

Abstract

CuCo2S4 is regarded as a promising electrode material for supercapacitor, but has inferior conductivity and poor cycle stability which restrict its wide-range applications. In this work, hierarchically hybrid composite of CuCo2S4/carbon nanotubes (CNTs) was synthesized using a facile hydrothermal and sulfuration process. The embedded CNTs in the CuCo2S4 matrix provided numerous effective paths for electron transfer and ion diffusion, and thus promoted the faradaic reactions of the CuCo2S4 electrode in the energy storage processes. The CuCo2S4/CNTs-3.2% electrode exhibited a significantly increased specific capacitance of 557.5 F g-1 compared with those of the pristine CuCo2S4 electrode (373.4 F g-1) and CuO/Co3O4/CNTs-3.2% electrode (356.5 F g-1) at a current density of 1 A g-1. An asymmetric supercapacitor (ASC) was assembled using the CuCo2S4/CNTs-3.2% as the positive electrode and the active carbon as the negative electrode, which exhibited an energy density of 23.2 Wh kg-1 at a power density of 402.7 W kg-1. Moreover, the residual specific capacitance of this ASC device retained 85.7 % of its original value after tested for 10000 cycles, indicating its excellent cycle stability.

Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries

“…The other two peaks at 787.5 and 803.7 eV can be fitted with two shakeup satellite (''sat. "), which are higher than the peaks of Co 2p 3/2 and Co 2p 1/2 , respectively [40,41]. The Ni 2p spectrum in Fig.…”

Room-temperature synthesized porous Cu(OH)2/Cu7S4 hybrid nanowires as a high-performance electrode material for asymmetric supercapacitors

“…9a, which include CuS1.96//AC (10.5 Wh kg -1 at 750 W kg -1 ) 48 , CuCo2S4//AC (15 Wh kg -1 at 400 W kg -1 ) 71 , CuS//AC (16.0 Wh kg -1 at 185.4 W kg -1 ) 24 , Cu(OH)2//AC (18.3 Wh kg -1 at 326 W kg -1 ) 31 , CuS//AC (26.0 Wh kg -1 at 2700 W kg -1 ) 72 . Even compared with those made of copper-based hybrid materials such as Ni3S2-Cu1.8S//AC (30.9 Wh kg -1 at 798 W kg -1 ) 63 , CuS@MnS//AC (20.17 Wh kg -1 at 224.67 W kg -1 ) 73 , CuCo2S4//AC(23.2 Wh kg -1 at 402.7 W kg -1 ) 69 , the Cu(OH)2/Cu7S4//AC ASC prepared in this study also shows higher energy and power density.…”

Realizing Superior Redox Kinetics of Hollow Bimetallic Sulfide Nanoarchitectures by Defect‐Induced Manipulation toward Flexible Solid‐State Supercapacitors

“…Up to now, extensive research on CuCo 2 S 4 nanostructures has been carried out, including hybridization with highly conductive skeletons to increase the exposed electrochemically active sites and nanostructuring to reduce the particle size. [10,11] Nevertheless, the electrochemical performance of these CuCo 2 S 4 -based nanostructures is still far below expectations, because these methods cannot fundamentally modulate their electrical properties while ion diffusion barriers have not been specifically addressed.…”